Gluing phenolic

[B2431]

Waht is the best way to glue two piece of phenolic together?

Dan, U.S. Air Force, retired

[Bob Kuykendall]

Earlier, (B2431) wrote:

> Waht is the best way to glue two piece of phenolic together?

I've never had to glue chunks of phenolic together. But I have glued
phenolic to fiberglass (both epoxy and polyester resin) to form
reinforcing pads where composite structure meets steel structure. For
that I always scarf the edges of the phenolic to an included angle of
about 30 degrees, and I always sand or grind the phenolic to take the
shiny finish off of it.

There are some pictures on this Web page of me bonding in the phenolic
reinforcements for a test control stick installation:

http://www.hpaircraft.com/center_stick/update_26_march.htm

And here's some pictures of a composite wing spar with Garolite
reinforcements where the main pin bores will be:

http://www.hpaircraft.com/hp-24/update_4_dec_02.htm
http://www.hpaircraft.com/hp-24/update_21_march_04.htm

As far as what's the best way to join phenolic parts together, I guess
it depends on what specific kind of phenolic you're using (These days
I mostly use Garolite G10, which I'm not sure you'd really call
"phenolic"). And also what kinds of loads you're trying to transfer
through the glue joint. I can't give you much general advice there -
the only things I know that work are the things I've tested.

I hope that helps some.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com/hp-24

[Leon McAtee]

(B2431) wrote in message >...
> Waht is the best way to glue two piece of phenolic together?
>
> Dan, U.S. Air Force, retired


In my experience the best way to glue phenolic together is with AN3-X.
Most if not all of the epoxy resins we homebuilders use bonds poorly
to phenolic. Drilling holes in the phenolic fitting and using cotton
flox in the resin as a kind of composite rivet makes for a useable
structure. Think encapsulation rather than bonding.
=====================
Leon McAtee
Q builder

[B2431]

>(Leon McAtee)
>Date: 6/9/2004 7:14 PM Central Daylight Time
>Message-id: >
>
(B2431) wrote in message
>...
>> Waht is the best way to glue two piece of phenolic together?
>>
>> Dan, U.S. Air Force, retired
>
>
>In my experience the best way to glue phenolic together is with AN3-X.
> Most if not all of the epoxy resins we homebuilders use bonds poorly
>to phenolic. Drilling holes in the phenolic fitting and using cotton
>flox in the resin as a kind of composite rivet makes for a useable
>structure. Think encapsulation rather than bonding.
>=====================
>Leon McAtee
>Q builder

I am building and LED indicator lamp holder. I have a 3/8" and a 1/8" phenolic.
I want to glue/epoxy them together to make 1/2" thick. Using your idea of
encapsulation how would I do this?

Dan, U.S. Air Force, retired

[Leon McAtee]

Think encapsulation rather than bonding.
> >=====================
> >Leon McAtee
> >Q builder

Thought you were thinking about structural things like rudder
hinges.....

For what your considering - I think - just sand well with something
like 120 grit sandpaper and use any good epoxy. Whack it with a
hammer and it will probably break at the epoxy/phenolic surface but
for holding LEDS it should be just fine.


> I am building and LED indicator lamp holder. I have a 3/8" and a 1/8" phenolic.
> I want to glue/epoxy them together to make 1/2" thick. Using your idea of
> encapsulation how would I do this?
>
> Dan, U.S. Air Force, retired